18854993 has 2 divisors, whose sum is σ = 18854994. Its totient is φ = 18854992.

The previous prime is 18854987. The next prime is 18854999. The reversal of 18854993 is 39945881.

It is a balanced prime because it is at equal distance from previous prime (18854987) and next prime (18854999).

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 2347024 = 4063^2 + 1532^2 .

It is an emirp because it is prime and its reverse (39945881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18854993 - 2²⁰ = 17806417 is a prime.

It is a super-2 number, since 2×18854993² = 711021522060098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18854999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9427496 + 9427497.

It is an arithmetic number, because the mean of its divisors is an integer number (9427497).

Almost surely, 2^18854993 is an apocalyptic number.

It is an amenable number.

18854993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18854993 is an equidigital number, since it uses as much as digits as its factorization.

18854993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 18854993 is about 4342.2336418023. The cubic root of 18854993 is about 266.1595938658.

The spelling of 18854993 in words is "eighteen million, eight hundred fifty-four thousand, nine hundred ninety-three".